Follow the club's safety rules first and foremost - eyes and ears. NEVER more than 2 in the gun and ONLY when it's your turn to shoot and you are on station. Any basic load, no load larger than 1-1/8 nor shot larger than 7.5. Don't bring your duck or goose loads.
TELL everyone you are brand new. Is this a registered actual match or just some guys showing up to shoot? BIG difference in attitude when money is on the line...
After safety, don't sweat your score, focus on the target - not your sight - and have some fun. Keep the gun moving on those targets and don't peek (lift your head)
Stopping the swing and lifting head are the two main reasons for missing.
http://mynssa.nssa-nsca.org/rule-book/
Take a glimpse at the rules.....